VTK/Examples/Cxx/PolyData/DetermineArrayDataTypes

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This example shows how to determine the type of data stored in a named array in a vtp file.

DetermineArrayDataTypes.cxx

#include <vtkSmartPointer.h>
#include <vtkPolyData.h>
#include <vtkPointData.h>
#include <vtkXMLPolyDataReader.h>
#include <vector>
#include <string>
 
void FindAllData(const std::string &inputFilename);
 
int main(int argc, char *argv[])
{
  if(argc != 2)
    {
    std::cout << "Usage: " << argv[0] << " InputFilename" << std::endl;
    return EXIT_FAILURE;
    }
 
  std::string inputFilename = argv[1];
  FindAllData(inputFilename);
 
  return EXIT_SUCCESS;
}
 
void FindAllData(const std::string &InputFilename)
{
  vtkSmartPointer<vtkXMLPolyDataReader> reader =
    vtkSmartPointer<vtkXMLPolyDataReader>::New();
  reader->SetFileName(InputFilename.c_str());
  reader->Update();
  vtkPolyData* polydata = reader->GetOutput();
 
  unsigned int numberOfArrays = polydata->GetPointData()->GetNumberOfArrays();
  std::cout << "NumArrays: " << numberOfArrays << std::endl;
 
  std::cout << "key: " << std::endl;;
  //more values can be found in <VTK_DIR>/Common/vtkSetGet.h
  std::cout << VTK_UNSIGNED_CHAR << " unsigned char" << std::endl;
  std::cout << VTK_UNSIGNED_INT << " unsigned int" << std::endl;
  std::cout << VTK_FLOAT << " float" << std::endl;
  std::cout << VTK_DOUBLE << " double" << std::endl;
 
  std::vector<std::string> arrayNames;
  for(unsigned int i = 0; i < numberOfArrays; i++)
    {
    //the following two lines are equivalent
    //arrayNames.push_back(polydata->GetPointData()->GetArray(i)->GetName());
    arrayNames.push_back(polydata->GetPointData()->GetArrayName(i));
    int dataTypeID = polydata->GetPointData()->GetArray(i)->GetDataType();
    std::cout << "Array " << i << ": " << arrayNames[i] << " (type: " << dataTypeID << ")" << std::endl;
    }
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(DetermineArrayDataTypes)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
if (APPLE)
  add_executable(DetermineArrayDataTypes MACOSX_BUNDLE DetermineArrayDataTypes.cxx)
else()
  add_executable(DetermineArrayDataTypes DetermineArrayDataTypes.cxx)
endif()
 
if(VTK_LIBRARIES)
  target_link_libraries(DetermineArrayDataTypes ${VTK_LIBRARIES})
else()
  target_link_libraries(DetermineArrayDataTypes vtkHybrid )
endif()
Retrieved from "http://batchmake.org/Wiki/VTK/Examples/Cxx/PolyData/DetermineArrayDataTypes"
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